ELECTRICAL CONNECTOR ASSEMBLY HAVING TWO SPACED INTERNAL PRINTED CIRCUIT BOARDS AND AN EXTERNAL METALLIC GASKET

Abstract

An electrical connector assembly (100) comprises: a housing (1) having a front mating portion (13) and a rear body portion (12). The rear body portion is greater in cross-section than the mating portion. An insulative spacer (3) is positioned in the housing. Two printed circuit boards (2) sandwich the insulative spacer. The two printed circuit boards and the insulative spacer are supported by the housing. And a metallic gasket (9) is assembled to an outer surface of the front mating portion and having an inserting portion (915, 925) extending into the housing and attached to the insulative spacer.

Description

FIELD OF THE INVENTION

The present invention relates to input/output (I/O) connectors with high-density configuration and high data transmitting rate.

DESCRIPTION OF PRIOR ART

U.S. Pat. No. 7,281,937 issued to Reed et al. on Oct. 16, 2007 discloses a plug connector. The plug connector defines a body portion and a mating portion extending forwardly from a front face of the body portion and having a groove thereon. An elastomeric ring gasket is received into the groove of the mating portion and it encircles and sits thereon near the front face of body portion to provide a seal against EMI radiation when in use. U.S. Patent Application Publication No. 2010/0130063 to Lang et al. published on May 27, 2010 also discloses a plug connector with an elastomeric ring gasket formed thereon to provide anti-EMI function. The plug connector defines a larger body portion and a smaller mating portion. The elastomeric ring gasket also encircles the smaller mating portion. The gasket is preferably formed from a continuous band of elastomeric material that contains conductive matter so as to render it conductive in ways known in the art. U.S. Patent Application Publication No. 2011/0256776 to Reed et al. published on Oct. 20, 2011 also relates to a similar type of connector, further disclosing a fastening clip for retaining two housing halves.

An electrical connector having an improved gasket is desired.

SUMMARY OF THE INVENTION

Accordingly, an object of the present invention is to provide an electrical connector assembly with high-density configuration and high data transmitting rate, and with anti-EMI function.

In order to achieve the above-mentioned objects, an electrical connector assembly comprises: a housing having a front mating portion and a rear body portion, the rear body portion being greater in cross-section than the mating portion; an insulative spacer positioned in the housing; two printed circuit boards sandwiching the insulative spacer, the two printed circuit boards and the insulative spacer being supported by the housing; and a metallic gasket assembled to an outer surface of the front mating portion and having an inserting portion extending into the housing and attached to the insulative spacer.

Other objects, features and advantages of the invention will be apparent from the following detailed description taken in connection with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of an electrical connector assembly in accordance with the present invention;

FIG. 2 is another perspective view of the electrical connector assembly of FIG. 1;

FIG. 3 is an exploded, perspective view of the electrical connector assembly of FIG. 1;

FIG. 4 is an exploded, perspective view of the electrical connector assembly of FIG. 2;

FIG. 5 is a partial exploded, perspective view of the electrical connector assembly of FIG. 1;

FIG. 6 is a partial exploded, perspective view of the electrical connector assembly of FIG. 2;

FIG. 7 is a cross section view of the electrical connector assembly of FIG. 1 taken along line 7-7;

FIG. 8 is a cross section view of the electrical connector assembly of FIG. 1 taken along line 8-8;

FIG. 9 is a cross section view of the electrical connector assembly of FIG. 1 taken along line 9-9;

FIG. 10 is a cross section view of the electrical connector assembly of FIG. 1 taken along line 10-10; and

FIG. 11 is a cross section view of the electrical connector assembly of FIG. 1 taken along line 11-11.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

Reference will now be made to the drawing figures to describe the present invention in detail.

FIGS. 1 to 4 illustrate perspective views of an electrical connector assembly 100 made in accordance with the present invention. And in conjunction with FIGS. 7 to 8, the electrical connector assembly 100 comprises a housing 1 having a receiving room 11 therein, two paralleled printed circuit boards (PCBs) 2 positioned in the receiving room 11, a spacer 3 disposed between the two printed circuits boards 2 and positioned with the housing 1, two cables 4 respectively electrically connected with the two printed circuit boards 2, and a strain relief 5 disposed in the housing 1 and spaced apart with the two cables 4 along a vertical direction. The electrical connector assembly 100 further comprises a latch mechanism assembled to a top surface of the housing 1 and a metallic holder 8 surrounding a portion of the housing 1 and the latch mechanism. The latch mechanism comprises a latching member 6 and a pulling member 7 interconnected with each other. The electrical connector assembly 100 further comprises a metallic gasket 9 surrounding a front portion of the housing 1.

Referring to FIGS. 1 to 6, the housing 1 is made of metallic material and formed by die-casting. The housing 1 defines a body portion 12 and a mating portion 13 extending forward from the body portion 12 for mating to a complementary connector (not shown). The body portion 12 has a cross section greater than that of the mating portion 13. The housing 1 defines a receiving room 11 extending rearward from a front surface to a rear surface thereof The body portion 12 of the housing 1 defines a top surface 121. The mating portion 13 of the housing 1 also defines a top surface 131. The top surface 121 is disposed above the top surface 131. The body portion 12 defines a receiving cavity 14 extending downwardly from the top surface 121 for a distance and located on a front end of the body portion 12. The receiving cavity 14 has a bottom surface 141 located on a same level with the top face 131. In addition, a pair of supporting posts 143 are formed on two inner side surfaces of the receiving cavity 14 for supporting a front end of the connecting section 72 of the pulling member 7.

Referring to FIGS. 1 to 6, the housing 1 comprises a first shield part 15 and a second shield part 16 assembled with each other along a vertical direction. The first shield part 15 and the second shield part 16 are mated with each other along a horizontal plane. The first shield part 15 defines a rectangular frame 151 formed at a front end thereof and defined as a mating port of the housing 1. The first shield part 15 further defines a top wall (not labeled) extending rearwardly from the rectangular frame 151 and a pair of side walls (not labeled) extending downwardly from two sides of the top wall.

Referring to FIGS. 3 to 4, the first shield part 15 defines a first receiving passage 153 extending along a front-to-rear direction and communicated with an exterior along an up-to-down direction. Further, the first shield part 15 defines two first positioning posts 154 formed on an inner side surface thereof and another two first positioning posts 154 formed on another inner side surface thereof Each of two first positioning posts 154 are spaced apart with each other along a front-to-rear direction. Each first positioning post 154 has a semi-circular cross section. The first positioning posts 154 are used for supporting the printed circuit board 2 along an up-to-down direction. In addition, two second positioning posts 155 are respectively formed on two inner side surface of the first shield part 15. Each second positioning post 155 is disposed between the two first positioning posts 154 along a front-to-rear direction for limiting a movement of the printed circuit board 2 along a front to rear direction. Each second positioning post 155 also has a semi-circular cross section. And, the second positioning post 155 is longer than the first positioning post 154 along a vertical direction. The first shield part 15 defines a first depressed section 156 formed on an outer surface of a front portion of the first shield part 15.

Referring to FIGS. 3 to 4 again, the second shield part 16 is structured as a cover and defines a bottom wall (not labeled) and a pair of side walls (not labeled) extending upwardly from two sides of the bottom wall. The second shield part 16 defines a second receiving passage 161 formed therein and extending along a front-to-rear direction. The second shield part 16 also defines two first positioning posts 162 and a second positioning post 163 on an inner side surface of the second receiving passage 161. The second shield part 16 defines another two first positioning posts 162 and a second positioning post 163 on another inner side surface of the second receiving passage 161. Each second positioning post 163 is disposed between two first positioning posts 162 along a front-to-rear direction. The first positioning posts 162 are used for supporting the printed circuit board 2 along an up-to-down direction. The second positioning posts 163 are used for limiting a movement of the printed circuit board 2 along a front to rear direction. The second shield part 16 also defines a second depressed section 164 formed on an outer surface of a front portion of the second shield part 16. The housing 1 defines a depressed area formed on an outer surface of the mating portion 13 formed by the first depressed section 156 and the second depressed section 164.

Referring to FIGS. 5 to 6 and in conjunction with FIG. 8, the two printed circuit boards 2 are received into the receiving room 11 of the housing 1. Each of the printed circuit board 2 defines a front mating section 21 and a rear terminating section 22. The mating section 21 defines a plurality of conductive pads 211 formed on a top and bottom surfaces thereof The terminating section 22 also defines a plurality of conductive pads (not shown) formed on a top and bottom surfaces thereof And, each of the printed circuit board 2 defines two projections 23 extending outwardly from two sides thereof Each projection 23 defines a cutout 24 cooperating with a second positioning post 155, 163. Thus, the two printed circuit boards 2 are respectively limited by the second positioning posts 155, 163 along a front-to-rear direction.

Referring to FIGS. 5 to 6 again and in conjunction with FIGS. 8 and 11, the spacer 3 is formed of insulative material and defines a top surface and a bottom surface. The spacer 3 defines a pair of ribs 31 respectively formed at two sides of the top surface and another pair of ribs 31 respectively formed at two sides of the bottom surface for supporting two printed circuit boards 2. Two projections 32 are respectively formed at two sides of the spacer 3. The spacer 3 further defines a pair of grooves 33 respectively formed on the two projections 32 extending along a vertical direction for cooperating with the two second positioning posts 155, 163. The spacer 3 further defines a grounding plate 35 integrative formed therein. A pair of slits 34 are respectively formed in the two projections 32 for a portion of the metallic gasket 9 extending into the spacer 3.

Referring to FIGS. 3 and 4, each of the cables 4 has a plurality of conductors 41 electrically connected to the terminating section 22 of the printed circuit board 2. And, a ring 42 is surrounded to an outer surface of the cable 4.

Referring to FIGS. 3 to 6 and in conjunction with FIGS. 12 and 14, a strain relief 5 is made of metallic material and disposed in a rear section of the receiving room 11 of the housing 1. The strain relief 5 has two recesses 51 respectively formed on a top and bottom surfaces thereof for receiving a portion of the two rings 42. The strain relief 5 defines a pair of receiving holes 52 formed on a rear surface thereof for receiving a pair of engaging pieces 53.

Referring to FIGS. 3 to 6, the latching member 6 is stamped and formed from a metallic plate and comprises a vertical retaining portion 61, a connecting portion 62 extending forwardly from a bottom side of the retaining portion 61 and a latching portion 63 extending forwardly from the connecting portion 62. A front portion of the latch 6 is defined as a latching portion 63. The retaining portion 61 defines a plurality of sharp projections 611 formed at two sides thereof The connecting portion 62 defines a rectangular hole 621 for a front end of the pulling member 7 passing through. The latching portion 63 defines a pair of barbs 631 formed at two sides thereof

Referring to FIGS. 3 to 6 again, the pulling member 7 is made of insulative material and structured in a flat shape. The pulling member 7 defines a T-shape actuating section 73, a rear operating section 71 and a connecting section 72 connecting the actuating section 73 and the rear operating section 71. A tape 74 is connected to a rear end of the actuating section 73 of the pulling member 7.

Referring to FIGS. 3 to 6 yet again, the metallic holder 8 defines a main portion 81 binding the first shield part 15 and the second shield part 16 together and a shielding portion 82. The main portion 81 is structured in a rectangular frame shape and has a top wall 811, a bottom wall 812 and a pair of side walls 813 connected with the top wall 811 and the bottom wall 812. The shielding portion 82 extends forwardly and downwardly from the top wall 811. Each side wall 813 defines a tab 83 extending inwardly from a rear edge thereof And, the tab 83 is perpendicular to the side wall 813 and defines a through hole 831 in alignment with a receiving hole 52 of the strain relief 5 along a front-to-rear direction. The top wall 811 and the bottom wall 812 respectively has two spring tabs (not labeled) to hold the first shield part 15 and second shield part 16 along a vertical direction.

Referring to FIGS. 2 to 6 and in conjunction with FIG. 8, two engaging pieces 53 are assembled to the strain relief 5. In this embodiment, the engaging piece 53 is a screw. Two screws 53 pass through the two through holes 831 and received into the receiving holes 52 to interlock the metallic holder 8 and the strain relief 5. As the strain relief 5 is disposed in the housing 1, so the metallic holder 8 is indirectly positioned with the housing 1 through the screws 53.

Referring to FIGS. 1 to 4 and in conjunction with FIGS. 7 to 11, the metallic gasket 9 is received into the depressed area 156, 164 of the mating portion 13 of the housing 1. The metallic gasket 9 comprises a first gasket 91 and a second gasket 92 respectively received into the first depressed section 156 and the second depressed section 164. The first and second gasket 91, 92 are respectively stamped from a metallic sheet and structured in a U-shaped frame. The first gasket 91 defines a top wall 911 and a pair of side walls 912 extending downwardly from two edges of the top wall 911. The top wall 911 of the first gasket 91 defines a plurality of first fingers 913 extending rearwardly and upwardly from a front edge of the top wall 911 and a plurality of second fingers 914 stamped outwardly from the top wall 911. Each of the side wall 912 of the first gasket 91 also defines a plurality of first fingers 913 extending rearwardly and outwardly from a front edge of the side wall 912 and a plurality of second fingers 914 stamped outwardly from the side wall 912. The plurality of first fingers 913 are located on an inner side of the plurality of second fingers 914 and protected by the plurality of second fingers 914. And, it should be noted that each of the first finger 913 is overlapped with a corresponding second finger 914 in a vertical direction. Further more, each of the side wall 912 of the first gasket 91 further defines a horizontal section 915 extending inwardly. The first gasket 91 defines a plurality of holes 916 formed on a rear edge thereof A plurality of rear ends of the first and second fingers 913, 914 will be received into the holes 916 when the first and second fingers 913, 914 are pressed inwardly. In addition, two apertures (not labeled) are formed on the second fingers 914 of the top wall 911 to cooperate with a pair of barbs 631 of the latching member 6. The second gasket 92 defines a bottom wall 921 and a pair of side walls 922 extending upwardly from two edges of the bottom wall 921. The bottom wall 921 of the second gasket 92 defines a plurality of first fingers 923 extending rearwardly and outwardly from a front edge of the bottom wall 921 and a plurality of second fingers 924 stamped outwardly from the bottom wall 921. Each of the side wall 922 of the second gasket 92 also defines a plurality of first fingers 923 extending rearwardly and outwardly from a front edge of the side wall 922 and a plurality of second fingers 924 stamped outwardly from the side wall 922. The plurality of first fingers 923 are located on an inner side of the plurality of second fingers 914 and protected by the plurality of second fingers 924. And, it should be noted that each of the first finger 923 is overlapped with a corresponding second finger 924 in a vertical direction. Further more, each of the side wall 922 of the second gasket 92 further defines a horizontal section 925 extending inwardly. The second gasket 92 defines a plurality of holes 926 formed on a rear edge thereof A plurality of rear ends of the first and second fingers 923, 924 will be received into the holes 916 when the first and second fingers 923, 924 are pressed inwardly. The metallic gasket 9 defines an inserting portion extending into the housing 1. The horizontal sections 915, 925 can be defined as inserting portions.

Referring to FIGS. 1 to 11, the assembling process of the electrical connector assembly 100 made in according to the present invention starts from soldering the conductors 41 of each cable 4 to the terminating section 22 of the printed circuit board 2. Thus, two combinations of the cable 4 and the printed circuit board 2 are accomplished.

Then, turn over the first shield part 15 so that the first receiving passage 153 faces upward and assemble a combination of the cable 4 and the printed circuit board 2 into the first receiving passage 153. The printed circuit board 2 is supported by the first positioning posts 154 along a vertical direction. The printed circuit board 2 is positioned with the first shield part 15 along a front-to-rear direction due to two cutouts 24 of the printed circuit board 2 cooperated with the pair of second positioning posts 155 of the first shield part 15. And, a front end of the cable 4 is supported by a rear end of the first shield part 15.

Then, the strain relief 5 is assembled to a rear end of the first shield part 15. And, the ring 42 is sandwiched by the rear end of the first shield part 15 and the strain relief 5. Thus, the ring 42 is received into a room formed by the strain relief 5 and the first shield part 15.

Then, the spacer 3 is assembled into the first receiving passage 153 of the first shield part 15 to make the two grooves 33 of the spacer 3 in alignment with the two second positioning posts 155. The spacer 3 is located on the printed circuit board 2.

Then, the first gasket 91 is assembled to the first depressed section 156. At this time, two horizontal sections 915 of the first gasket 91 are inserted into the two slits 34 of the spacer 3. Thus, the spacer 3 is positioned with the first gasket 91.

Then, another combination of the printed circuit board 2 and the cable 4 together is assembled to the first shield part 15. The printed circuit board 2 is located on the spacer 3. The mating section 21 of the printed circuit board 2 is received into the rectangular frame 151 of the first shield part 15. The two cutouts 24 of the printed circuit board 2 are in alignment with two grooves 33 of the spacer 3. The ring 42 of the cable is supported by the strain relief 5. The spacer 3 is sandwiched between the two printed circuit boards 2.

Then, the second gasket 92 is assembled to the second depressed section 164 of the second shield part 16.

Then, the second shield part 16 and the second gasket 92 are assembled to the first shield part 15. Thus, the housing 1 is formed by the first shield part 15 and the second shield part 16. At this time, the first positioning posts 162 attach to the printed circuit board 2. And, the second positioning posts 163 are respectively passed through the two cutouts 24 of the printed circuit board 2 and two grooves 33 of the spacer 3 in turn. Thus, the printed circuit board 2 and the spacer 3 are positioned with the second shield part 16 along a front-to-rear direction. After, the second shield part 16 is assembled to the first shield part 15, the two printed circuit boards 2 and the spacer 3 are all positioned in the housing 1. At this time, the inserting portions 915, 925 extend into the housing 1 and insert into the spacer 3. Thus, the first and second gasket 91, 92 are both firmly engaged with the housing 1. Two printed circuit boards 2 and the spacer 3 are positioned by the first and second parts 15, 16 along a front-to-rear direction and an up-to-down direction.

Then, assemble the latching member 6 to the pulling member 7 together through following steps. Firstly, the latching member 6 is disposed in front of pulling member 7 and arranged perpendicular to the pulling member 7. Secondly, the actuating section 73 of the pulling member 7 is passed through the rectangular hole 621 of the latching member 6 and located below the latching member 6. Thirdly, the latching member 6 is rotated 90 degree to make the latching member 6 and the pulling member 6 arranged in line. Thus, the latching member 6 is interconnected with the pulling member 7. And, the latching member 6 is not easily discrete from the pulling member 7 due to the width of a free end of the actuating section 73 is wider than the rectangular hole 621. The actuating section 73 will be moved along an upward and rearward direction when the pulling member 7 is exerted by a horizontal force.

Then, assemble the latching member 6 and the pulling member 7 together to an exterior surface of housing 1. The connecting section 72 of the pulling member 7 is located on the top surface 121 of the body portion 12 of the housing 1. A front end of the connecting section 72 of the pulling member 7 is supported by the pair of supporting posts 143 extended into the receiving cavity 14. The operating section 71 of the pulling member 7 extends rearwardly beyond the rear surface of the housing 1. In addition, the latching member 6 is received into the receiving cavity 14. Thus, the actuating section 73 of the pulling member 7 is disposed between the latching member 6 and the bottom surface 141 of the receiving cavity 14. The retaining portion 61 of the latching member 6 is engaged with the housing 1. The connecting portion 62 of the latching member 6 is located above the bottom surface 141. The latching portion 63 extends forwardly and is located above the top surface 131 of the mating portion 13 of the housing 1. The latching portion 63 is cantilevered from the retaining portion 61. When a rearward pulling force is exerted on a rear end of the pulling member 7 or the tape 74, the latching portion 63 of the latching member 6 will be raised up. When the rearward pulling force is released, the latching portion 63 of the latching member 6 will resume to an original state.

Finally, assemble a metallic holder 8 to the housing 1. The main portion 81 of the metallic holder 8 binds the first part 15, the second shield part 16 and a portion of the pulling member 7 together. The pulling member 7 can be moved along a front to rear direction relative to the housing 1 and limited by the metallic holder 8 along a vertical direction. The strain relief 5 is also limited in the housing 1 by the metallic holder 8 through the pair of screws 53. The rear end of the latching member 6 and the front end of the pulling member 7 are shielded by the shielding portion 82 of the metallic holder 8.

After the above assembling steps, the metallic gasket 9 is firmly fixed to the housing 1 and will not be easily disengaged from the housing 1. If the housing 1 defines two or more mating portions, two adjacent metallic gasket 9 assembled to the two mating portions are not easily separated from the two mating portions due to the tight spacing therebetween. Thus, the electrical connector assembly 100 will achieve better EMI suppressing effect.

It will be understood that the invention may be embodied in other specific forms without departing from the spirit or central characteristics thereof The present examples and embodiments, therefore, are to be considered in all respects as illustrative and not restrictive, and the invention is not to be limited to the details given herein.

Claims

1. An electrical connector assembly comprising:

a housing having a front mating portion and a rear body portion, the rear body portion being greater in cross-section than the mating portion;

an insulative spacer positioned in the housing;

two printed circuit boards sandwiching the insulative spacer, the two printed circuit boards and the insulative spacer being supported by the housing; and

a metallic gasket assembled to an outer surface of the front mating portion and having an inserting portion extending into the housing and attached to the insulative spacer.

2. The electrical connector assembly as recited in claim 1, wherein the housing comprises a first shied part and a second shield part assembled with each other along a vertical direction, and the inserting portion extends into the housing along a mating plane between the first shield part and the second shield part.

3. The electrical connector assembly as recited in claim 2, wherein the metallic gasket comprises a first gasket and a second gasket respectively assembled to the first and second shield parts, and the inserting portion comprises respective two free ends of each of the first and second gaskets.

4. The electrical connector assembly as recited in claim 3, wherein the spacer comprises two slits on two sides thereof, and the two free ends of each of the first and second gaskets are inserted into the two slits, respectively.

5. The electrical connector assembly as recited in claim 2, further comprising a metallic holder binding the first and second shield parts together.

6. The electrical connector assembly as recited in claim 5, further comprising a strain relief sandwiched by the first and second shield parts and surrounded by the metallic holder.

7. The electrical connector assembly as recited in claim 6, further comprising means for engaging the metallic holder to the strain relief

8. The electrical connector assembly as recited in claim 5, further comprising a latch mechanism assembled to an exterior surface of the housing and a top wall of the metallic holder.

9. The electrical connector assembly as recited in claim 8, wherein the latch mechanism comprises a latching member and a pulling member interconnected with each other

10. An electrical connector assembly comprising:

a housing defining a receiving room communicating with an exterior in a front-to-back direction, and including a large first part and a second small part, each of the first part and the second part essentially providing one half of the housing to be stacked with the other in one of a vertical direction and a transverse direction under condition that the vertical direction, the transverse direction and the front-to-back direction are perpendicular to one another, while a front portion of the first part alone defining a rectangular frame to provide a whole structure of a front portion of the housing without involvement with the second part; and

a pair of metallic gaskets respectively attached upon exterior surfaces of the first part and the second part; wherein

each of the metallic gaskets includes a flange confronting another flange of the other gaskets in said one direction around an interface between the first part and the second part.

11. The electrical connector assembly as claimed in claim 10, wherein said one direction is the vertical direction.

12. The electrical connector assembly as claimed in claim 10, wherein each of the gaskets essentially defines a roughly U-shaped structure.

13. The electrical connector assembly as claimed in claim 10, wherein a mating port defined in the housing is located in front of the pair of gaskets while a deflectable latch is located behind the pair of gaskets.

14. The electrical connector assembly as claimed in claim 13, further including a metallic holder enclosing both the first part and the second part to not only retain the first part and the second part together but also restrain movement of the deflectable latch.

15. The electrical connector assembly as claimed in claim 10, further including an insulative spacer in the receiving room, wherein the flanges of said pair of gaskets inserted into the spacer for retention.

16. The electrical connector assembly as claimed in claim 15,wherein said spacer holds a pair of printed circuit boards on two opposite sides in the vertical direction.

17. The electrical connector assembly as claimed in claim 10, further including a metallic holder enclosing both the first part and the second part to not only retain the first part and the second part together.

18. An electrical connector assembly comprising:

a housing defining a receiving room communicating with an exterior in a front-to-back direction, and including a large first part and a second small part, each of the first part and the second part essentially providing one half of the housing to be stacked with the other in one of a vertical direction and a transverse direction under condition that the vertical direction, the transverse direction and the front-to-back direction are perpendicular to one another, while a front portion of the first part alone defining a rectangular frame to provide a whole structure of a front portion of the housing without involvement with the second part; and

an insulative spacer in the receiving room; and

a pair of metallic gaskets respectively attached upon exterior surfaces of the first part and the second part; wherein

each of the metallic gaskets includes a flange retained in the spacer.

19. The electrical connector assembly as claimed in claim 18, wherein said one direction is the vertical direction.

20. The electrical connector assemble as claimed in claim 19, wherein said spacer holds a pair of printed circuit boards on two opposite sides in the vertical direction.